Chelicerata Heymons, 1901
Count: 2c;12o; †6o;2f;23g
   †Eurypterida Burmeister, 1843 - eurypterids
  Count: [†g] †21f;73g [26 Dec 2020]
     †Eurypterina Burmeister, 1843
    Count: [†g] †13f;42g [26 Dec 2020]
       Superfamily †'Eurypteroidea' Burmeister, 1843 [monophyletic?]
      Count: [†g] †4f;9g [25 Dec 2020]
         Family †Dolichopteridae Kjellesvig-Waering & Størmer, 1952
        Count: [†g] †3g [25 Dec 2020]
           Genus †Dolichopterus Hall, 1859
          Count: -